Abstract
Sash gang saws with narrow-kerf saw blades are used in the production of glued laminate flooring elements in plants where dry technology is applied. This means that boards or friezes are sawn into top layer lamellae in dry conditions (moisture content of about 10–12%) from expensive wood species, often exotic. The object of this research was stellite-tipped teeth of narrow kerf saw blades sharpened under industrial conditions. A NIKON ECLIPSE Ti-S microscope equipped with a NIKON DS-Fi2 recording camera was used to take pictures of teeth, which were analysed in a graphical software to measure the radii of the main cutting edges. The high-quality images obtained were used to determine the values of the rounding radii of the cutting edges. It was noted that the quality of edges regenerated in industrial conditions, some of which had chipping, was lower than that of brand new saw blades.
Highlights
The accuracy of cutting, especially with narrow-kerf saw blades of low initial stiffness, depends mainly on the state of the cutting edges
The application of numerical simulation to determine the ability of air used in the minimum quantity lubrication (MQL) method to clean grinding wheel active surfaces during the sharpening of hob cutters was proposed by Stachurski et al [6]
The second analysis performed on the results obtained was an analysis of variance (ANOVA), which was used to determine the significance of differences between the values of the cutting edges’ radii of the new saw blade and the sharpened saw blade [41]
Summary
The accuracy of cutting, especially with narrow-kerf saw blades of low initial stiffness, depends mainly on the state of the cutting edges. It was found that the values of feed forces, occurring during wood cutting on sash gang saws, depend on cutting parameters but mainly on the stereometric features of the teeth and the accuracy of their manufacture [1]. High feed forces cause a reduction of initial stiffness values to operating stiffness values [2,3]. This phenomenon causes inaccuracies in sawing [4] because saw blades are sensitive to thrust forces and to feed forces [1,2,3]. In [8], it was found that as the number of sharpenings increases, the mean value of the pull broach tooth wear on the clearance face, the magnitude of the standard deviation, and the coefficient of variance increase, which indicates a decrease in the reliability of the broach operation
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